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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160; </div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="keyword">namespace </span>resumef</div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;{</div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="preprocessor">#ifndef DOXYGEN_SKIP_PROPERTY</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160; </div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;    <span class="keyword">struct </span>task_t</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;    {</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;        task_t();</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;        <span class="keyword">virtual</span> ~task_t();</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160; </div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;    <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;        <span class="keyword">friend</span> scheduler_t;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;        counted_ptr&lt;state_base_t&gt; _state;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;    };</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160; </div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;    <span class="comment">//----------------------------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160; </div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty, <span class="keyword">class</span> = std::<span class="keywordtype">void</span>_t&lt;&gt;&gt;</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    <span class="keyword">struct </span>task_impl_t;</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160; </div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor">#ifndef DOXYGEN_SKIP_PROPERTY</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty&gt;</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    <span class="keyword">struct </span>task_impl_t&lt;_Ty, std::void_t&lt;traits::is_future&lt;std::remove_reference_t&lt;_Ty&gt;&gt;&gt;&gt; : <span class="keyword">public</span> task_t</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    {</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        <span class="keyword">using</span> future_type = std::remove_reference_t&lt;_Ty&gt;;</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        <span class="keyword">using</span> value_type = <span class="keyword">typename</span> future_type::value_type;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        <span class="keyword">using</span> state_type = state_t&lt;value_type&gt;;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160; </div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;        task_impl_t() = <span class="keywordflow">default</span>;</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        task_impl_t(future_type&amp; f)</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;        {</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;            initialize(f);</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        }</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;        <span class="keywordtype">void</span> initialize(future_type&amp; f)</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;        {</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;            _state = f._state.get();</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;        }</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    };</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160; </div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ty&gt;</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    <span class="keyword">struct </span>task_impl_t&lt;generator_t&lt;_Ty&gt;&gt; : <span class="keyword">public</span> task_t</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    {</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;        <span class="keyword">using</span> value_type = _Ty;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        <span class="keyword">using</span> future_type = generator_t&lt;value_type&gt;;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;        <span class="keyword">using</span> state_type = state_generator_t;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160; </div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;        task_impl_t() = <span class="keywordflow">default</span>;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;        task_impl_t(future_type&amp; f)</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        {</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;            initialize(f);</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;        }</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        <span class="keywordtype">void</span> initialize(future_type&amp; f)</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        {</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;            _state = f.detach_state();</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;        }</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    };</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160; </div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    <span class="comment">//----------------------------------------------------------------------------------------------</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160; </div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <span class="comment">//ctx_task_t接受的是一个&#39;函数对象&#39;</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    <span class="comment">//这个&#39;函数对象&#39;被调用后，返回generator&lt;_Ty&gt;/future_t&lt;_Ty&gt;类型</span></div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    <span class="comment">//然后&#39;函数对象&#39;作为异步执行的上下文状态保存起来</span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    <span class="keyword">template</span>&lt;<span class="keyword">class</span> _Ctx&gt;</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    <span class="keyword">struct </span>task_ctx_impl_t : <span class="keyword">public</span> task_impl_t&lt;remove_cvref_t&lt;decltype(std::declval&lt;_Ctx&gt;()())&gt;&gt;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    {</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        <span class="keyword">using</span> context_type = _Ctx;</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160; </div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        context_type    _context;</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160; </div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;        task_ctx_impl_t(context_type ctx)</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;            : _context(std::move(ctx))</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        {</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;            decltype(<span class="keyword">auto</span>) f = _context();</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;            this-&gt;initialize(f);</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        }</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    };</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="preprocessor">#endif  //DOXYGEN_SKIP_PROPERTY</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;}</div>
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